code: def test_viz_image():
      img = mx.nd.zeros((300, 300, 3), dtype=np.uint8)
      ax = gcv.utils.viz.plot_image(img)
      ax = gcv.utils.viz.plot_image(img, ax=ax, reverse_rgb=True)
  
file_path: gluon-cv/tests/unittests/test_utils_viz.py
imports: from __future__ import print_function
  from __future__ import division
  import unittest
  import mxnet
  import numpy
  import gluoncv
label_desc: Use image node_id 2 for calling a global function with example usage: test_viz_image() without return types